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(FILES): This May 5, 2015 file photo shows Justin Bieber arriving for the Costume Institute Gala Benefit at The Metropolitan Museum of Art in New York. Pop celebrity Justin Bieber says he is developing a "futuristic" sound for "very personal" songs as he completes a long-awaited album. The 21-year-old Canadian singer revealed that he is performing both drums and guitar on the album, on which he is collaborating with electronic producer Skrillex, legendary rap and rock producer Rick Rubin, and rap giant Kanye West. AFP PHOTO / Files / TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images